I wrote a C/C++ binding of shared memory access from nodejs. 
https://github.com/supipd/node-shm
Still work in progress (but working for me), maybe usefull, if bug or 
suggestion, inform me.

Exactly like a Simon wrote, already are here real cases for using shared 
memory from node.js.
And potential concurrency issues (solvable) aren't reason to not use shared 
memory.
Maybe bigger problem is "eventable" shared memory, something like "inform 
me, when someting is changed".
In case of one process as central-shared-memory-manager can be there some 
form of sending very small ((-:
TCP packet "Hey You, signed ChangeOfValue subscriptor, somebody changed 
Your area of interest in SharedMemoryControlledByMe",
as source of change event, on which COV client read shared memory to accept 
changes. 
Instead of TCP sending potentially large amount of bytes, this event system 
simple MUST be (and is) faster.

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